Electric heating apparatus for liquids



K. F. HENNEMAN ELECTRIC HEATING APPARATUS FOR LIQUIDS March 30 1926.

Filed August 14. 1924 J'nventor.

Patented Mar. 30, 1926.

UNITED STATES Parent aQ'rFIQE.

KAREL FREDERICK HENNEMAII, OF THE HAGUE, NEI'HEREANDS, ASSIGNOR OE ONE= HALF T0 PIETER KERKHGVE'N,

OF THE HAGUE, NETHERLANDS.

ELECTRIC HEATING APPARATUS F01?) LIQUIDS.

Application filed August 14, 192.4." $eria1' No. 732,111.

To: aZZ whom it may (W/WWW."

Be it known that I, Kaitlin. Fnnnnnnr I'TENNEMAN, a subject of the Queen o the Netherlands, and residing at The Hague, Netherlands, Atjehstraat 69, have invented certainnew and useful Improvements in and Relating to an Electric Heating Apparatus for Liquids, of which the following is a specification. I

The invention relates to an electric heating' apparatus for liquids.

'llheapparatus as such may be arranged in a water conduit or the like with-conections to dry-cocks or it may be connected to the switching device of the same inventors in accordance with United States patent application Serial No. 673,211, in which latter case the greatest efficiency will be obtained.

The object of the invention is toprovide an apparatus wherein by a small consump tion of current the liquid may quicklybe raised to the desired temperature wh-ilstthe use of the connection is at the same time quite safe.

with the apparatus hitherto generally used, the heating winding is arranged in an insulating heat-conducting cover or the wire of the winding is surrounded by a coating. The heat radiated by the glowing wire is therefore not directly communicated to the liquid but only through the insulating coating, with the result, that the liquid comes to the desired temperature less quickly.

Further apparatuses are known wherein an electrically heated wire is directly immersed in the liquid so that all heat developed is absorbed by the liquid. As however, it has appeared in practice that these apparatuses are not without danger, they are not allowed to be used or only when several precautions have been taken. Further these apparatuses have not yet been constructed for larger capacities.

According to the invention an apparatus is provided which may be constructed for any capacity whilst it may be worked without risk.

The apparatus according to the invention consists in the first place of tubes and the like through which the liquid flows and in each tube is provided a heating wire of the heating winding.

According to the invention each tube may be provided with an insulating coating or cover e. a glass tube, fixedly secured therein.

Further the heating. winding may be ac cordingto the invention consistot bare preferably spirally wound wires each of which are connected with one end to a separate current supply and withthe other end are connected together to a starpoint.

Further according to the invention a heating wire may be connected to a contact which is arranged in a block; of insulating material, which is fixedly securedto the apparatus and which preferably extends in to the insulating cover or coating-of the accessory tube.

The apparatus may'furth'er be surrounded by ahea-t insulating casing in-suchamannen that the temperature of the heated liquid in th apparatus decreases only slowly.

As the wires immediately communicate the heat tothe liquidno losses occur and the liquidis very quickly brought to the dc;- sired temperature, whilst on account cf the speciai constructive embodiment of'thein sulating blocks-which extend into the glass tubeno electrolysis can occur. As more over the heating winding consists of clean wires which are all arranged separately eventual disturbances may soon be found and repaired.

An embodiment of the invention is shown in the accompanying drawings.

Fig. 1 is a front view of an apparatus according to the invention, partially in cross section.

Fig. 2 shows a top view of the apparatus according to Fig. 1.

Fig. 3 shows a bottom view of the apparatus over the line IIIIII in Fig. 1.

By 1 are preferably indicated the brass water conduits which are secured in the head piece 2 and the foot piece 3. Each tube is provided with an insulating coating, in the example glass tube 4, which by means of nipples with outerthread 5 are secured in the headpiece 2 and the footpiece 8. A watertight connection is obtained by means of packing inserted between said nipples 5 and the tube 1, so that no liquid can pass between the glass tube 4: and the tube 1. In the cover 6 of the head piece 2 holes are provided for locating the blocks 7 of insulating material wherein are the contactterminals 8. These blocks 7 are provided with a shoulder 9 which rests on the ledge 10 of the holes. A packing ring is laid between the shoulder 9 and the ledge 10, so that by means of a nipple with outerthread 11 a watertight connection is obtained. Through the blocks 7 is a through conductor 12 to which the heating wire 13 which is preferably wound spirally is secured inany suitable manner. These blocks extend into the glass tubes 4, thereby preventing the occurrence of electrolysis when using the apparatus. The cover 6 is attached to the headpiece 2 by means of screws 14. Further the headpiece possesses two terminals 15 for coupling a second heating apparatus and for connecting the tube to the drycock. By means of a double nipple with a left and a right thread these connections may be established in a simple manner. The heating wires 18 lead through the tubes 1 and 4 downward and are here in the footpiece 3 connected in a starpoint by means of a bridge piece 16. The footpiece 3 is adapted to be shut oif by a cover 17. Also this footpiece 3 possesses two terminals 18.

Further the apparatus may be enclosed in a casing 19 'which casing is indicated in Fig. 1 with dot-dash-lines. This casing may be covered with cork, slagwool or the like, so that rapid cooling of the water which is in the apparatus is prevented.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed I declare, that what I claim is:

1. An electric heating apparatus for liquids, comprising a plurality oftubes arranged side by side and forming the Sole conduit for the passage of the liquid, means for connecting the said tubes with each other, an insulating layer coating each tube, a heating element having an exposed heating wire located in each tube, saidheating wires being connected at one end to the current supply means and being connected at the other ends in a starpoint.

2. An electric heating apparatus for liquids, comprising a plurality of tubes arranged side by side and forming the sole conduit for the flow of liquid, a glass tube mounted in each of said conduit tubes and forming the passage for the liquid, a heating element having one exposed heating wire in each glass tube, said heating wires being connected at one end to current supply means and being connected at the other ends in a starpoint.

3. An lectric heating apparatus for -liquids according to claim 1, comprismg a contact secured to each of said wires, a block of insulating material carrying said contact and extending into the tube, each heating wire being wound spirally within said tube.

4. An electric heating apparatus for liquids according to claim 1 comprising at least two inlet connections for the liquid and at least two outlet connections for the liquid, to permit the connection of a plurality of apparatus. 7

In testimony whereof I afliX my signature.

KAREL FREDERIK HENNEMAN. 

